Question # 1

The typical nuclei are less than:

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10^-16m

10^-14m

10^-12m

10^-10m

The place for soring the nuclear waste is

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Ocean

Damping in earth

Damping in desert

Bottom of old salt mines

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

Which diode works at reverse biasing.

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LED

Photo voltaic cell

Photo diode

Silicon diode

In pure capacitor A.C. circuit, the current I and charge q are.

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In phase

Out of phase

Parallel to each other

None of above

Heat sensitive resistors are called.

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resistors

Capacitor

Thermistors

Inductors

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

Materials can be identified by measuring their

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Mass

Half life

Both a and b

None of a,b,c

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

The number of neutrons in Li are

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2

3

4

7

If magnetic field is doubled then magnetic energy density becomes.

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Four times

Two times

Three times

Six times

Drift velocity of electrons is.

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10^-1 m/s

10^-2 m/s

10^-3 m/s

10³ m/s

unit of Plank's constant is same as that of.

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Acceleration

Angular momentum

Linear momentum

Entropy

Radius of first Bohr's orbit is.

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0.053 nm

0.053 mm

0.053 micro meter

0.053 m

The symbol of p-n-p transistor is

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If the distance between the two charged bodies is halved, the force between them becomes.

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Double

Half

Four times

One times

The resistivity of two wires isρ₁ andρ₂ which are connected in series. If there dimentions are same then the equivalent resistivity of the combination will be:

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(ρ₁ +ρ₂)

1/ρ₁+ 1/ρ₂

ρ₁+ρ₂/2

ρ_1/ρ₂

If current flowing through a solenoid becomes four times, then magnetic field inside becomes.

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two times

three times

four times

Half

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